IN REPLY REFER TO 
 
UNITED STATES 
DEPARTMENT OF THE INTERIOR 
FISH AND WILDLIFE SERVICE 
WILDLIFE RESEARCH LABORATORY 
546 CUSTOMHOUSE, DENVERe2COLORADO 
November 6, 1945. 
Dr. Aldo Leopold, 
Department of Wildlife Management, 
424 University Farm Place, 
Madison 5, Wisconsin. 
Dear Dr. Leopoldt 
I appreciate your letter of November 2 in which you indicate that 
the subject of deterrents is in fact a matter of much interest. It is 
true that at the present time we have had so many problems shot at us that

we have not had personnel to do an adequate job with all of them. As a 
result some of the things that we would like to do with deterrents have 
not been done. 
My own interest is a continuation of the studies undertaken to make 
rodent baits less hazardous tQ birds. Since my earlier work, which was 
presented at the Denver Wildlife Conference, we have carried out widely 
separated experiments, and I am hoping to bring these together in a paper

in the not distant future. The subject, however, is deserving of a more 
thorough and scholarly approach than we have been able to give it up to 
the present time. 
As to the legality of several States pooling Pittman-Robertson funds 
for such a research with respect to pheasants, I cannot give the answer but

I am transmitting a copy of your letter as well as this reply to our Chicago

office. 
You may be interested that even the Quartermaster Corps of the Army, 
with whom wehave had many contacts during the war on the subject of de- 
terrents, is interested in a continuation of such studies aimed primarily

at a reduction of damage to stored food by rats. We are now in the process

of negotiating some added work along that line. Between your suggestion and

that which may come from the Army, I am hoping to see the deterrent studies

elaborated. You will hear from me later on this subject. 
 
Ve 
 
Director.